so I took 2 digital pregnancy test last week & they both said "not pregnant " so I was like okay am…

so I took 2 digital pregnancy test last week & they both said "not pregnant " so I was like okay am not pregnant... so I just kinda forgot about it ...but now am getting this flittery movement in my lower abdomen and iv did some research on it but I don't know what could this mean? did I test to early?